Elizabeth's "flat" grandparents came home from Portugal for Christmas and stayed with us for the better part of a month before heading to Angola. (They are flat because they usually visit via Skype on the television screen). Elizabeth enjoyed having her "Bapa" and "Mummy" around as willing playmates.
They say that kids make up their own names for grandparents, especially if you call them both "Grandma and Grandpa" like we've been doing. Grandma H was very surprised when Elizabeth started calling her Mummy. Turns out she heard Auntie Janice calling her that! Soon after Elizabeth went to visit her Grandma and Grandpa J. When I asked her if she had fun playing with Grandma J, Elizabeth corrected me. "Margaret", she insisted. My mother was pretty amused, although she says she remembers being similarly confused as a child by the difference between titles and names. I think we've got Elizabeth saying Grandma again now though.
Daddy wanted to know whether Elizabeth knew our names. "What's Mommy's name, Elizabeth?" he asked. The wheels went around and around as she thought about it. There was a pregnant pause, and then... "MOMMY", she said triumphantly.
Somehow both Grandpas have remained "Bapa".